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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › do i have an air leak?
07-25-2012 08:58 PM  8 years ago
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torque

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bolivia , north carolina

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do i have an air leak?
i have a zenoah 270RC in one of my helicopters. it has been running great for the past year and a half. then it developed a surging. at mid stick the motor has a bad surge, if i lean up or richen it, the next flight the engine might surge at full throttle, or mid throttle. i have replaced the carb. insulator block and it still does it. i have noticed a oily black residue on top of the fan, thought maybe a seal is gone. it idles fine. .
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07-25-2012 10:30 PM  8 years ago
Billme

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MS

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Hi torque

Probably the seal.. Some engine builders take the spring off the seal, and after while it curls up and starts leaking.. I don't like this practice just to gain a 100 rpms..
Also, if its not put on right to begin with will cause problems even with the spring..
Fitting the crank through the seal usually takes two or three movements back and forth to get the seal lip to rest properly...

Bill
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07-26-2012 12:31 AM  8 years ago
torque

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bolivia , north carolina

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thanks bill, i am almost sure that is what is causing the surging. i put in another spark plug this evening just to rule that out.
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